Hersevoort, of Dublin, was riding alongside her husband, going north on Foothill Road, about a quarter mile south of Golden Eagle Way, when both were struck by a car just after 1 p.m., according to Lt. Brian Laurence.
Laurence said the driver of the car, an 18-year-old Pleasanton resident, was heading north at the time of the crash. He stopped and cooperated with police.
Hersevoort was thrown from her bicycle and pronounced dead at the scene, while her husband was taken to a hospital with injuries not considered life-threatening, Laurence said.
The cause of the collision is under investigation.
Anyone with information on this crash is asked to call Pleasanton police at (925) 931-5100.
